EVOLUTIONARY PRESSURES IN BIRDS Every body system of a bird shows some adaptation for flight. These adaptations are endothermy, feathers, acute senses, long, flexible necks and lightweight hones. EXTERNAL STRUCTURE…
DEVELOPMENT OF ENDOSPERM The primary endosperm nucleus divides repeatedly. It forms polyploidy nutritive tissue called endosperm. There are two types of seeds for storage of food: b) Endospertnic or albuminous…
Multiple CHOICE QUESTIONS OF PTERIDOPHYTA 1. The vascular tissue is confined to the central region of the stem forming: (a) Bundles (b) stele (c) Cortex (d) Pcricycle 2. The leaves which…
The tissues in which the cells are undifferentiated and capable of division are called meristem. The activity of meristem Causes growth in plant. Meristem adds new cells continuously. The apices…
SHORT QUESTIONS OF PTERIDOPHYTA 1. Give occurrence of pteridophytes. Ans: Pteridophyta is a group of ancient plants. They formed the dominant part of the earths during Palaeozoic and Mesozoic periods.…
NGIOSPERM Syllabus: Introduction Occurrence Angiosperms are flowering plant. Their seeds are covered by fruits. Their fertile leaves bear ovules. The fertile leaves are folded and joined to from ovaries. The…
TYPE 3: EPHEDRA Occurrence Ephedra is an arid plant. It is found in Europe, Western and Central Asia and Central and South America. It is also found in arid areas…
MODEL SUBJECTIVE QUESTIONS OF PTERIDOPHYTA 1. Describe general structure and life cycle of Pteridophytes. 2. Give classification of pteridophytes. 3. Describe different types of stele in Pteridophytes. 4. Describe vegetative…
TYPE 2: PINUS cones Occurrence The genus Pinus has about 90 species. It has world wide in distribution. They are mostly present in the temperate regions. Four species of pinus…
TYPE I: CYCAS Occurrence Cycas has a limited distribution. It is found in south East Asia and Australia. Cycas is also cultivated as an ornamental plant in the gardens and…
saadia
abida
sidra